I have a b3aggr file that I used to mirror Juno.
I tried to re-run the aggregation now that Juno SR1 was released, but the
aggregation fails.

Is the Juno repository broken?

here's the error:

Cannot complete the install because of a conflicting dependency.
Only one of the following can be installed at once:
EMFFacet NatTable Widget Table Configuration Editor (Deprecated)
(Incubation) Source 0.2.0.v201206120903
(org.eclipse.emf.facet.widgets.nattable.tableconfiguration.editor.source
0.2.0.v201206120903)
org.eclipse.emf.facet.widgets.nattable.tableconfiguration.editor.source
0.2.1.v201209110754